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Method for preparing sponge iron from sulfate cinder

A technology of sulfuric acid slag and sponge iron, which is applied to furnaces, furnace types, fluidized bed furnaces, etc., can solve the problems affecting the production cost of sponge iron and high natural gas costs, and achieve large environmental benefits and energy-saving effects, reducing the amount of solid waste Less, the effect of accelerating the reduction reaction speed

Inactive Publication Date: 2014-05-14
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cost of natural gas in China is high, which directly affects the production cost of sponge iron

Method used

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  • Method for preparing sponge iron from sulfate cinder
  • Method for preparing sponge iron from sulfate cinder
  • Method for preparing sponge iron from sulfate cinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Raw materials:

[0061] 1. Composition of sulfuric acid slag before pretreatment:

[0062]

[0063] Note: All iron contains FeO, Fe 2 o 3 , Fe 3 o 4 , The converted oxide content is 70-78%.

[0064] 2. Composition and properties of bituminous coal:

[0065]

[0066] 3. CaCO 3 Purity ≥ 98%.

[0067] 2. Key equipment: (all existing equipment)

[0068] Wet magnetic separator; single-trough flotation machine XFD 1.5L; 101-3 drying oven; SXZ-12-16 high-temperature box-type resistance furnace; jaw crusher; fine mill; dry magnetic separator.

[0069] 3. Main reagents:

[0070] Sodium hydroxide (mass concentration 5%), dixanthate (mass concentration 1%), starch (mass concentration 2%), 2# oil (industrial mineral processing agent crude oil).

[0071] Fourth, the specific operation process:

[0072] 1. Sulfuric acid slag pretreatment: Stir the sulfuric acid slag to adjust slurry, remove some silicates and phosphorus-containing minerals by magnetic separation; ...

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Abstract

The invention relates to the field of metallurgy of non-ferrous metals, and concretely provides a method for preparing sponge iron from sulfate cinder. The method uses sulfate cinder as a raw material, soft coal as a reducing agent and CaCO3 as a desulfurizer, and adopts a concentric tube filling mode for charging or a pellet mixing mode for charging, wherein the charging mass ratio of the sulfate cinder to the soft coal to the CaCO3 is 100:(34-35):(6-7). The method comprises the following steps of: roasting at 1100 DEG C to 1200 DEG C for 3.5 hours to 4.0 hours, quenching under a shielding gas atmosphere to obtain roasted ore, and obtaining sponge iron by performing magnetic separation on the roasted ore, wherein in the sponge iron, the total iron content is greater than or equal to 93.41%, the degree of metallization is greater than or equal to 96.38%, the content of impurity except S is less than or equal to 0.016%, and the content of SiO2 plus Al2O3 is less than or equal to 5.32%, which all reach the national standards. According to the invention, the sponge iron is directly produced from sulfate cinder without the processes of sintering and iron making, thus saving energy and having a wide range of sources of raw materials.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, and specifically provides a method for preparing sponge iron from sulfuric acid slag. Background technique [0002] Sulfuric acid slag is the waste residue after pyrite acid production, and it is one of the main solid wastes produced by the chemical industry. For every ton of sulfuric acid produced, 0.8 to 1.5 tons of pyrite cinders will be discharged, and the country will discharge thousands of tons of sulfuric acid cinders every year. Pyrite cinder is a very valuable secondary resource, the utilization rate of foreign countries is more than 80%, while the utilization rate of pyrite cinder in my country is low, less than 50%. [0003] Comprehensive utilization of pyrite slag has been extensively studied at home and abroad. Such as making bricks and making cement additives; extracting valuable metals; used in blast furnace ironmaking after sorting; preparing iron red, iron yellow, iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
Inventor 赵建湘周虎强王全亮刘霞
Owner HUNAN RES INST FOR NONFERROUS METALS
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